ScsiIf-common.cc
上传用户:weiliju62
上传日期:2007-01-06
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文件大小:2k
- /* cdrdao - write audio CD-Rs in disc-at-once mode
- *
- * Copyright (C) 1999 Andreas Mueller <mueller@daneb.ping.de>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- */
- /*
- * $Log$
- */
- // checks if unit is ready
- // return: 0: OK, ready
- // 1: not ready (busy)
- // 2: not ready, no disk in drive
- // 3: scsi command failed
- int ScsiIf::testUnitReady()
- {
- unsigned char cmd[6];
- const unsigned char *senseData;
- int senseLen;
- int ret = 0;
- memset(cmd, 0, 6);
- switch (sendCmd(cmd, 6, NULL, 0, NULL, 0, 0)) {
- case 1:
- ret = 3;
- break;
- case 2:
- senseData = getSense(senseLen);
- switch (senseData[2] & 0x0f) {
- case 0x02: // Not ready
- switch (senseData[12]) {
- case 0x3a: // medium not present
- ret = 2;
- break;
- default:
- ret = 1;
- break;
- }
- break;
- case 0x06: // Unit attention
- ret = 0;
- break;
- default:
- ret = 3;
- break;
- }
- }
- return ret;
- }